When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The 85mm to 80mm is on the intake side. I can measure the backside diameter when I get home tonite. No economy job here.... I paid extra for the backbore option and he started with a brandnew Throttle Body.